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WorksheetsAS Organic Chemistry Review
Total questions: 25
Worksheet time: 25mins
Which of the following types of radiation can directly result in bond breaking?
Infrared
Microwave
Radiowave
Ultraviolet
This question is about the reaction of methane with bromine in sunlight.
CH4 + Br2 → CH3Br + HBr
This reaction is best described as
electrophilic addition
electrophilic substitution
free radical addition
free radical substitution
One of the eps in the mechanism of this reaction is
•CH3 + Br• → CH3 Br
This step is
initiation
propagation
termination
reduction
Consider the following compounds, P, Q, R and S.
The boiling temperatures of compounds P, Q, R and S increase in the order
P Q R S
Q P S R
Q S P R
R S P Q
Ethane reacts with chlorine when the substances are exposed to UV radiation. The equation for this reaction is
C2H6 + Cl2 → C2H5Cl + HCl
C2H6 + Cl2 → C2H4Cl2 + H2
C2H6 + Cl2 → 2CH3Cl
C2H4 + Cl2 → C2H4Cl2
What is the formula of poly(but-1-ene)?
Electrophiles are
A electron pair donors that are attracted to regions of high electron density.
electron pair donors that are attracted to regions of low electron density.
electron pair acceptors that are attracted to regions of high electron density.
electron pair acceptors that are attracted to regions of low electron density
Which of the following represents a step in the mechanism during the reaction between ethene and hydrogen bromide?
C2H4 + Br+ → C2H4Br+
C2H4 + HBr → C2H5+ + Br-
C2H4 + HBr → C2H5● + Br●
C2H4 + HBr → C2H4Br– + H+
The mechanism of the reaction between ethene and hydrogen bromide is
electrophilic addition
electrophilic substitution
nucleophilic addition
nucleophilic substitution
Four organic reactions are shown.
Which reaction is a substitution reaction?
A
B
C
D
Which of these compounds is a secondary halogenoalkane?
CH3CH(OH)CH3
CH3CCl(CH3)CH3
CH3CHClCH3
CH3CH2CH2Cl
Bromoethane reacts with aqueous potassium hydroxide to form ethanol. Which of the following statements about this reaction is NOT correct?
The OH- ions act as nucleophiles
Iodoethane will react more quickly than bromoethane in the same reaction
The reaction is an elimination reaction
The reaction needs to take place under reflux
Haloalkanes can be hydrolysed but the rate of hydrolysis varies. Which of the following statements is true?
CH3CH2I would be the fastest because the C-I bond has the biggest dipole
CH3CH2Cl would be the fastest because the C-Cl bond has the biggest dipole.
CH3CH2I would be fastest because it has the weakest C-I bond
CH3CH2Cl would be fastest because it has the weakest C-Cl bond
The reaction of the halogenoalkane, C2H5Cl, with alcoholic ammonia is
nucleophilic substitution
electrophilic substitution
reduction
elimination
When a chloroalkane is heated with aqueous sodium hydroxide
no reaction occurs with primary, secondary or tertiary chloroalkanes
a reaction occurs with primary and secondary chloroalkanes but not with tertiary chloroalkanes
a reaction occurs with tertiary chloroalkanes but not with primary and secondary chloroalkanes.
a reaction occurs with primary, secondary and tertiary chloroalkanes
Which of the following is a tertiary alcohol?
3-methylbutan-2-ol
2-methylbutan-2-ol
2-methylbutan-1-ol
2,2-dimethylpropan-1-ol
When sodium is added to ethanol, which of the following observations would be made?
Orange to green colour change
Effervescence
Yellow flame
No change
Which of the following isomeric alcohols, with molecular formula C5H12O, can be oxidized to a carboxylic acid with five carbon atoms?
Which of the following could be used to oxidize ethanol to ethanoic acid?
Concentrated H2SO4
H+/ Cr2O72–
H+/ Cr3+
Concentrated NaOH solution
The term “reflux” is best described as
continuous evaporation and condensation
heating to evaporation and separation
heating under reduced pressure and separation
constant boiling
Which molecule does not exhibit E / Z isomerism?
What is the systematic name for the compound with the following formula?
2-methyl-4-ethylpentane
2-ethyl-4-methylpentane
2,4-dimethylhexane
3,5-dimethylhexane
Name the compound below
E-2-chloropent-2-ene
Z-2-chloropent-3-ene
E-2-chloropent-3-ene
Z-2-chloropent-2-ene
Which of the following pairs are cis-trans isomers?
1 and 2
1 and 4
2 and 3
3 and 4
What is the systematic name for the hydrocarbon shown below?
1,4-dimethylbutane
2,3-dimethylbutane
2,3-dimethylhexane
1,1,2,2-tetramethylethane
